kafka KStreamFlatMap 源码
kafka KStreamFlatMap 代码
文件路径：/streams/src/main/java/org/apache/kafka/streams/kstream/internals/KStreamFlatMap.java
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.kafka.streams.kstream.internals;
import org.apache.kafka.streams.KeyValue;
import org.apache.kafka.streams.kstream.KeyValueMapper;
import org.apache.kafka.streams.processor.api.ContextualProcessor;
import org.apache.kafka.streams.processor.api.Processor;
import org.apache.kafka.streams.processor.api.ProcessorSupplier;
import org.apache.kafka.streams.processor.api.Record;
import java.util.Objects;
class KStreamFlatMap<KIn, VIn, KOut, VOut> implements ProcessorSupplier<KIn, VIn, KOut, VOut> {
private final KeyValueMapper<? super KIn, ? super VIn, ? extends Iterable<? extends KeyValue<? extends KOut, ? extends VOut>>> mapper;
KStreamFlatMap(final KeyValueMapper<? super KIn, ? super VIn, ? extends Iterable<? extends KeyValue<? extends KOut, ? extends VOut>>> mapper) {
this.mapper = mapper;
}
@Override
public Processor<KIn, VIn, KOut, VOut> get() {
return new KStreamFlatMapProcessor();
}
private class KStreamFlatMapProcessor extends ContextualProcessor<KIn, VIn, KOut, VOut> {
@Override
public void process(final Record<KIn, VIn> record) {
final Iterable<? extends KeyValue<? extends KOut, ? extends VOut>> newKeyValues =
mapper.apply(record.key(), record.value());
Objects.requireNonNull(newKeyValues, "The provided KeyValueMapper returned null which is not allowed.");
for (final KeyValue<? extends KOut, ? extends VOut> newPair : newKeyValues) {
context().forward(record.withKey(newPair.key).withValue(newPair.value));
}
}
}
}
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